On dynamic analysis method for large-scale train-track-substructure interaction  

作　　者：Lei Xu 

机构地区：[1]School of Civil Engineering,Central South University,Changsha 410075,China [2]National Engineering Laboratory for High-Speed Railway Construction,Changsha 410075,China

出　　处：《Railway Engineering Science》2022年第2期162-182,共21页铁道工程科学（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.52008404);the National Natural Science Foundation of Hunan Province(Grant No.2021JJ30850).

摘　　要：Train–track–substructure dynamic interaction is an extension of the vehicle–track coupled dynamics.It contributes to evaluate dynamic interaction and performance between train–track system and its substructures.For the first time,this work devotes to presenting engineering practical methods for modeling and solving such large-scale train–track–substructure interaction systems from a unified viewpoint.In this study,a train consists of several multi-rigid-body vehicles,and the track is modeled by various finite elements.The track length needs only satisfy the length of a train plus boundary length at two sides,despite how long the train moves on the track.The substructures and their interaction matrices to the upper track are established as independent modules,with no need for additionally building the track structures above substructures,and accordingly saving computational cost.Track–substructure local coordinates are defined to assist the confirming of the overlapped portions between the train–track system and the substructural system to effectively combine the cyclic calculation and iterative solution procedures.The advancement of this model lies in its convenience,efficiency and accuracy in continuously considering the vibration participation of multi-types of substructures against the moving of a train on the track.Numerical examples have shown the effectiveness of this method;besides,influence of substructures on train–track dynamic behaviors is illustrated accompanied by clarifying excitation difference of different track irregularity spectrums.

关 键 词：TRAIN Track dynamic interaction Railway substructures Finite elements Dynamics system Iterative solution Tunnel Bridge 

分 类 号：U270.1[机械工程—车辆工程] U213.2[交通运输工程—载运工具运用工程]